Anytime a background check is required an I.D. must be presented There is no Florida state requirement that criminal background checks be done on people buying firearms at gun shows, swap meets, or through newspaper or internet advertisements. Criminal background checks are only required if the buyer goes to a federally-licensed gun store. However, under FL law, counties may opt to require background checks on gun buyers at gun shows and flea markets. Aside from those counties which have opted to regulate gun shows, all "private" sales between individuals are not subject to the background check.